The synthesis will investigate the use of personal mobile or music devices to notify transit customers of an approaching next vehicle. Since each stop/station in a transit network has a unique identifier, current and potential transit customers could sign up with their local transit agency to have a "your vehicle will arrive in X minutes/seconds, it's time to leave" message delivered The customer will be able to establish a "notification" profile/subscription with the following information: selection of exact stop/station, vehicle route(s), time window for the notifications (for example alerts only in a 30-minute period in for the outbound peak). A literature review, survey of transit agencies, and case studies will provide this information in a user-friendly document for use by US transit agencies.